Electronic Design

LDOs Feature Small Size, Low Quiescent Current

The CAT6217 and CAT6218 low-dropout regulators (LDOs) from Catalyst Semiconductor Inc. source 150- and 300-mA output currents, respectively, in a tiny, five-lead, 1-mm profile thin SOT-23 package. The devices offer a low quiescent current of only 55 µA combined with a low typical dropout voltage of 90 mV at a 150-mA load for the CAT6217 and 180 mV at a 300-mA load for the CAT6218. Additionally, an external bypass capacitor reduces overall output noise, suiting the devices well for low-noise applications. Many LDOs incorporate a bypass capacitor, resulting in a slow "startup." However, Catalyst's LDOs are designed with a "quick start" feature that ensures a fast turnon time of less than 150 µs, further optimizing the devices for low-power applications.

The CAT6217 and CAT6218 eliminate battery drain when not in use by entering a "zero"-current shutdown mode. They also provide protection against short-circuit and thermal overload fault conditions. The CAT6217 is available in output voltages of 1.5, 1.8, 2.5, 2.8, 2.85, and 3.3 V. The CAT6218 offers output voltages of 1.8, 2.4, 2.7, 2.85, 3.0, 3.2, and 3.3 V.


Samples are available now. Projected lead time for production quantities is six to eight weeks. The CAT6217 costs $0.20 and the CAT6218 is $0.23 each, both in quantities of 10,000.


Visit www.catsemi.com.

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